heterogenesis heterogeneousness • heterogenetic · · · Info · Definitions · Synonyms · Characters · · heterogenesis · · Text Latin · · Script 13 · · Length Definitions · · · (noun) the alternation of two or more different forms in the life cycle of a plant or animal. Synonyms: alternation of generations, xenogenesis. · · Noun Definition 1 Synonyms · · · alternation of generations · · Synonym 1 xenogenesis · · Synonym 2 Characters · · e latin small letter e U+0065 g latin small letter g U+0067 h latin small letter h U+0068 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074